The Nurse Instructs a Patient Seen in the Outpatient Clinic

The nurse instructs a patient seen in the outpatient clinic with symptoms of renal calculi to strain all urine for which of the following primary purposes?

A) To validate the diagnosis of kidney stones
B) To obtain a stone for analysis of composition
C) To determine when a stone has passed from the system
D) To determine the extent of damage to the urinary system